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Old 05-17-2005, 04:47 PM
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need help with air/fuel

hey guys, well i just got back from the dyno with my 88 rx7 with a chevy 350 in it. the Engine: 1970 4 bolt, high nickle, nodular iron main caps, bored .30 over, flat top hypereutectic pistons, 215 cc dart iron eagle heads w/stainless 2.05/1.60 valves, comp solid lifter cam (Duration at .050: 260 Intake Valve Lift: 0.555 Exhaust Valve Lift: 0.555 Lobe Seperation: 110) comp alum. roller rockers (1.5), c.r. is 10.3:1, victor jr intake, trick 750 holley, Moroso electric H2O pump.

anyways i am running very very lean from idle to around 4-5000 rpm. after that it is fine and dandy, but i need to fix this problem. so any and all help is greatly appreciated. i just dont know where to start. we just tuned the carb with a vaccum gauge and it started out with 7 in's, and went up to 15. but i dont know the next step to take. so talk to yall soon. and thanks alot

ps. the hp numbers are very wrong... the car runs a 11.8 at 116. so if you do the calculating that puts it around 345 rwhp. which sounds more like it.

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Old 05-17-2005, 08:32 PM
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trick 750 holley
May not be to trick...? If its in the mid-range area as you say 4-5K rpm it sounds like both the power valve maybe to high and the main jets to small...? What carb (cfm) power valve (6.5 or...?) also what main jets...? Also does it have a "trick kit" or has it been worked and if so by who...?

Tuning it for vacume wont help for the rpm range your looking at...
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Old 05-17-2005, 08:48 PM
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i am not to sure about the size of the jets or the power valve. but i guess i can start taking the carb apart sometime this weekend and see whats what. so could the car be running where it needs to be in the upper rpm's be due to the fact that the secondaries are opening up and putting more fuel in there?!? and i am not sure what makes it trick, i have had the car for about 2 weeks now and the carb i dont know whats in it. but now i know where to start, i was just drawing a blank for real. couldnt think of what to do lol. thanks alot for the light bulb lol.

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Old 05-18-2005, 10:23 AM
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What size jet are you running in your primarys? How lean is "lean lean"? Up your primary jetting and see how that does. You should have done it on the dyno...why didnt the dyno operator recommend this to you?

When you up the primary you might richen the secondary so you might have to drop down a size on those as well.
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